how can i do this ?
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i must plot a graph like this:
(there are many functions that are valid for difference particular time in a period, for example for td interval function 1 is valid, for tr interval function 2 is valid...)
a code like this is okey:
x=0:0.1:1;
a=x.^2;
y=1:0.1:2;
b=y.^3;
z=2:0.1:3;
c=z.^3;
plot(x,a,y,b,z,c);
but i have to plot these functions, there is a mistake, would you help me please ?
k=0:10.^-12:6.9*10.^-9;
a=25*10.^-6*80;
l=6.9*10.^-9:10.^-12:2.29*10.^-8;
b=25*10.^-6*l./(16*10.^-9)*(80+(2.16-80)*l./(16*10.^-9));
m=2.29*10.^-8:10.^-12:2.5*10.^-6;
c=4*2.16;
n=2.5*10.^-6:10.^-12:2.515*10.^-6;
d=4*2.16;
o=2.515*10.^-6:10.^-12:2.5244*10.^-6;
e=80*4*((1-o./(9.4*10.^-9))*o./(9.4*10.^-9));
p=2.5244*10.^-6:10.^-12:5*10.^-6;
f=25*10.^-6*80;
plot(k,a,l,b,m,c,n,d,o,e,p,f);
??? Error using ==> mtimes
Inner matrix dimensions must agree.
2 个评论
Patrik Ek
2014-3-21
I you just want a nice plot I would recommend inkscape or paint, or any other program. Doing this in matlab is just a pain. Are you sure the equations are correct? also, you can just catenate the array and thus get rid of
plot(so many variables that I have no control and will definitely have an error);
Another advice is to plot each set one by one fix one at the time.
m
2014-3-22
采纳的回答
On the lines where you calculate b, and e, you probably want to use the element-wise multiplication .* instead of the matrix multiplication * between your two halves. For example:
b=25*10.^-6*l./(16*10.^-9).*(80+(2.16-80)*l./(16*10.^-9));
Also, I think you will want c,d, and f to be arrays, not scalars. For example:
c=4*2.16*ones(size(m));
3 个评论
m
2014-3-21
What exactly do you need help with? The other posters are right that your numbers don't make sense. For example, the value of "a" is 0.002, and the value of "e" is approximately -22,821,490. These are not going to show up nicely on the same plot.
Here is an example similar to your code with numbers that makes a nice plot. But we do not know what your numbers should be.
k=1:1:10;
a=25*ones(size(k));
l=10:1:20;
b=(l-10).^2+25;
m=20:1:30;
c=125*ones(size(m));
n=30:1:35;
d=-(n-30).^3+125;
o=35:1:40;
e=0*ones(size(o));
plot(k,a,l,b,m,c,n,d,o,e);
m
2014-3-22
更多回答（3 个）
Joseph Cheng
2014-3-21
0 个投票
You are missing some (.*) in both b= and e=. However your a,b,c,d,e,f curves doesn't match the pictured curve.
Joseph Cheng
2014-3-21
So you are not just plotting you are trying to find the point on the curve for any t?
They you are best off forming this into one array and not spread across multiple arrays.
example:
t=0:10e-12:5e-6;
A = zeros(size(t));
A(t>=0 & t<=6.9e-9) = 25e-6*80;
tempT =t(t>6.9e-9 & t<=2.29e-8);
A(t>6.9e-9 & t<=2.29e-8) = 25*10^-6*tempT./(16*10^-9).*(80+(2.16-80)*tempT./(16*10^-9));
A(t>2.29e-8 & t<2.5e-6)= 4*2.16;
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